CN117073790A - Nondestructive determination method and device for effective volume of sulfur hexafluoride electrical equipment - Google Patents
Nondestructive determination method and device for effective volume of sulfur hexafluoride electrical equipment Download PDFInfo
- Publication number
- CN117073790A CN117073790A CN202310863821.7A CN202310863821A CN117073790A CN 117073790 A CN117073790 A CN 117073790A CN 202310863821 A CN202310863821 A CN 202310863821A CN 117073790 A CN117073790 A CN 117073790A
- Authority
- CN
- China
- Prior art keywords
- electrical equipment
- constant volume
- sulfur hexafluoride
- pressure
- tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910018503 SF6 Inorganic materials 0.000 title claims abstract description 47
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 229960000909 sulfur hexafluoride Drugs 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000004065 semiconductor Substances 0.000 claims abstract description 26
- 238000005057 refrigeration Methods 0.000 claims abstract description 25
- 238000005259 measurement Methods 0.000 claims abstract description 23
- 238000007599 discharging Methods 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 238000000691 measurement method Methods 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000009659 non-destructive testing Methods 0.000 claims 7
- 238000012360 testing method Methods 0.000 claims 3
- 238000004891 communication Methods 0.000 claims 1
- 238000009530 blood pressure measurement Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 56
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F22/00—Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for
- G01F22/02—Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for involving measurement of pressure
Abstract
The application relates to a nondestructive measurement method and device for the effective volume of sulfur hexafluoride electrical equipment, wherein the measurement device comprises a first pressure gauge, a first thermometer, an electromagnetic valve, a constant volume tank and a semiconductor refrigeration module, wherein the first pressure gauge, the first thermometer and the electromagnetic valve are arranged on a connecting pipeline between a gas charging and discharging interface and the constant volume tank, the semiconductor refrigeration module is wrapped outside the constant volume tank, and the constant volume tank is connected with a second pressure gauge and a second thermometer. The application can directly measure the effective volume of the electrical equipment, is not limited to measurement in the process of charging and discharging the electrical equipment, does not need to be powered off when the electrical equipment is measured, stores the liquid sulfur hexafluoride in the constant volume tank, can store more gaseous sulfur hexafluoride in the electrical equipment by adopting the smaller constant volume tank, ensures the pressure measurement precision of the electrical equipment, thereby improving the measurement accuracy of the effective volume, and has small device volume and certain portability.
Description
Technical Field
The application relates to the field of nondestructive measurement, in particular to a nondestructive measurement method and device for effective volume of sulfur hexafluoride electrical equipment.
Background
Sulfur hexafluoride (SF) 6 ) Has excellent insulating property and arc extinguishing capability, and is widely applied to various medium-high voltage electrical equipment. However, sulfur hexafluoride, which is a gas having an extremely strong greenhouse effect, is one of 6 gases that need to be restricted. The reliability of the statistics results of the current sulfur hexafluoride gas consumption and the current sulfur hexafluoride gas discharge is not high, and the main reason is that part of the sulfur hexafluoride gas is not provided with effective volume data on the nameplate of the transportation equipment or the relevant data on the nameplate is fuzzy due to longer operation years, so that the gas quantity is difficult to accurately calculate through the gas pressure, the weighing method is limited by the field working environment, and the error of the gas quantity calculation result is large.
Disclosure of Invention
The embodiment of the application aims to provide a nondestructive measurement method and device for the effective volume of sulfur hexafluoride electrical equipment, which can directly measure the effective volume of the electrical equipment and is not limited to measurement in the process of charging and discharging the electrical equipment.
In order to achieve the above purpose, the present application provides the following technical solutions:
in a first aspect, an embodiment of the present application provides a nondestructive measurement device for an effective volume of a sulfur hexafluoride electrical apparatus, an air charging and discharging interface is provided on the electrical apparatus, the air charging and discharging interface is connected with a constant volume tank, the measurement device includes a first pressure gauge, a first thermometer, an electromagnetic valve, a constant volume tank and a semiconductor refrigeration module, the first pressure gauge, the first thermometer and the electromagnetic valve are provided on a connecting pipe between the air charging and discharging interface and the constant volume tank, the semiconductor refrigeration module is wrapped outside the constant volume tank, the constant volume tank is connected with a second pressure gauge and a second thermometer, and the effective volume of the sulfur hexafluoride electrical apparatus is measured in a nondestructive manner through cooperation of the first pressure gauge, the first thermometer, the electromagnetic valve, the constant volume tank, the semiconductor refrigeration module, the second pressure gauge and the second thermometer.
And the constant volume tank is also connected with a liquid level meter for measuring the liquid level of the constant volume tank.
In a second aspect, an embodiment of the present application provides a method for non-destructive measurement of an effective volume of a sulfur hexafluoride electrical apparatus, including the steps of:
a measuring device is connected between the air charging and discharging interface of the electrical equipment and the constant volume tank;
detecting the pre-gassing pressure P of an electrical apparatus 10 And temperature T 10 Detecting the pressure P before the constant volume tank is deflated 20 And temperature T 20 ；
Detecting the pressure of the electrical equipment in a charging and discharging state, and acquiring the pressure value P of the electrical equipment when the pressure drops by a threshold value 11 And a temperature value T 11 Obtaining the pressure value P of the constant volume tank 21 And a temperature value T 21 Indicating value H of liquid level meter 1 ；
According to the pressure P 10 Temperature T 10 Pressure P 20 Temperature T 20 Pressure value P 11 Temperature value T 11 Pressure value P 21 Temperature value T 21 Indicating value H of liquid level meter 1 Calculating the effective volume V of the air chamber of the electrical equipment 1 。
When the electrical equipment is deflated, the electromagnetic valve and the semiconductor refrigeration module are opened, and the gas flows to the constant volume tank.
The pressure of the detection electrical equipment in the inflation and deflation state is specifically detected by adopting a first pressure gauge.
After the measurement is completed, the gas in the constant volume tank is refilled into the electrical equipment, and the connection between the measuring device and the electrical equipment is removed.
The method is characterized in that the gas in the constant volume tank is recharged to the electrical equipment, namely, the semiconductor refrigeration module is reversely electrified to heat, the electromagnetic valve is opened, the constant volume tank is heated to a heating threshold value, and the gas in the constant volume tank is recharged to the electrical equipment.
Before the connection between the measuring device and the electrical equipment is removed, the gas pressure in the constant volume tank is reduced to a set value, and the charging and discharging valve and the electromagnetic valve of the electrical equipment are closed.
And the gas quantity of the pre-stored sulfur hexafluoride gas in the constant volume tank is equal to the residual gas quantity in the constant volume tank after the semiconductor refrigeration module is reversely heated.
The semiconductor refrigerator refrigerating temperature is set as a refrigerating threshold value.
Compared with the prior art, the application has the beneficial effects that: the application can directly measure the effective volume of the electrical equipment, is not limited to measurement in the process of charging and discharging the electrical equipment, does not need to be powered off when the electrical equipment is measured, and the application reversely heats the semiconductor refrigeration module to charge the gas into the electrical equipment after the measurement is completed, so that the application has almost no loss to sulfur hexafluoride gas.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a device according to an embodiment of the present application;
FIG. 2 is a flow chart of a method according to an embodiment of the application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
As shown in fig. 1, a nondestructive measurement device for effective volume of sulfur hexafluoride electrical equipment is provided with an air charging and discharging interface 2 on an electrical equipment 1, the air charging and discharging interface 2 is connected with a constant volume tank 6, the measurement device comprises a first pressure gauge 3, a first thermometer 4, an electromagnetic valve 5, the constant volume tank 6 and a semiconductor refrigeration module 7, the first pressure gauge 3, the first thermometer 4 and the electromagnetic valve 5 are arranged on a connecting pipeline between the air charging and discharging interface 2 and the constant volume tank 6, the semiconductor refrigeration module 7 is wrapped outside the constant volume tank 6, a second pressure gauge 8 and a second thermometer 9 are connected to the constant volume tank 6, and the effective volume of the sulfur hexafluoride electrical equipment is measured in a nondestructive mode through cooperation of the first pressure gauge 3, the first thermometer 4, the electromagnetic valve 5, the constant volume tank 6, the semiconductor refrigeration module 7, the second pressure gauge 8 and the second thermometer 9.
The constant volume tank 6 is also connected with a liquid level meter 10 for measuring the liquid level of the constant volume tank 6.
As shown in fig. 2, a nondestructive measurement method for the effective volume of sulfur hexafluoride electrical equipment comprises the following steps:
a measuring device is connected between the air charging and discharging interface of the electrical equipment and the constant volume tank;
detecting the pre-gassing pressure P of an electrical apparatus 10 And temperature T 10 Detecting the pressure P before the constant volume tank is deflated 20 And temperature T 20 ；
Detecting the pressure of the electrical equipment in a charging and discharging state, and acquiring the pressure value P of the electrical equipment when the pressure drops by a threshold value 11 And a temperature value T 11 Obtaining the pressure value P of the constant volume tank 21 And a temperature value T 21 Indicating value H of liquid level meter 1 ；
According to the pressure P 10 Temperature T 10 Pressure P 20 Temperature T 20 Pressure value P 11 Temperature value T 11 Pressure value P 21 Temperature value T 21 Indicating value H of liquid level meter 1 Calculating the effective volume V of the air chamber of the electrical equipment 1 。
In a preferred embodiment, the pressure drop threshold is set at 0.03MPa, i.e. the electronic valve is closed to stop venting when the pressure drops by 0.03MPa or when the liquid level in the constant volume tank reaches the maximum liquid level Hmax.
When the electrical equipment is deflated, the electromagnetic valve and the semiconductor refrigeration module are opened, and the gas flows to the constant volume tank.
The pressure of the detection electrical equipment in the inflation and deflation state is specifically detected by adopting a first pressure gauge.
After the measurement is completed, the gas in the constant volume tank is refilled into the electrical equipment, and the connection between the measuring device and the electrical equipment is removed.
The method is characterized in that the gas in the constant volume tank is recharged to the electrical equipment, namely, the semiconductor refrigeration module is reversely electrified to heat, the electromagnetic valve is opened, the constant volume tank is heated to a heating threshold value, and the gas in the constant volume tank is recharged to the electrical equipment.
In a preferred embodiment, the heating threshold is set at 60 ℃.
Before the connection between the measuring device and the electrical equipment is removed, the gas pressure in the constant volume tank is reduced to a set value, and the charging and discharging valve and the electromagnetic valve of the electrical equipment are closed.
And the gas quantity of the pre-stored sulfur hexafluoride gas in the constant volume tank is equal to the residual gas quantity in the constant volume tank after the semiconductor refrigeration module is reversely heated.
The semiconductor refrigerator refrigerating temperature is set as a refrigerating threshold value.
In a preferred embodiment, when the pressure is about 0.3MPa, the temperature drops below-50 ℃, the sulfur hexafluoride gas starts to liquefy, and the refrigeration threshold of the semiconductor refrigerator is set to be-60 ℃.
Example 1
The effective volume was used in the laboratory at 0.5m 3 The gas storage tank simulates an electrical equipment air chamber to verify the device.
(1) Vacuumizing the air storage tank to 133Pa by adopting a vacuum pump;
(2) And connecting the SF6 steel cylinder with the simulated air chamber through a pipeline, opening a valve, and inflating the simulated air chamber to 0.40MPa.
(3) And weighing the SF6 steel cylinder and the inflation pipeline before and after inflation by a weighing device to obtain 18.31kg of mass difference Deltam before and after inflation. (the value is regarded as the standard value of the gas quality of the simulation gas chamber)
(4) Wait about 5 hours, simulate SF in a gas chamber 6 The gas was warmed to ambient temperature T0 (18 ℃ C.) and the pressure was 0.46 MPa. (because of SF) 6 SF in steel cylinder 6 In liquid state, the temperature is reduced after gasification, so that the temperature of the gas filled into the simulation air chamber is extremely low, and in addition, under the condition of certain density, the temperature and the pressure of the gas are positively correlated, so that the temperature is increased to the ambient temperature, and the pressure is increased
(5) The application is arranged at the air chamber air charging and discharging port, the starting device is internally provided with a constant volume tank with the volume of 1L. (optionally pre-storing a small amount of SF during the first use) 6 Because a small amount of SF remains in the constant volume tank after the reverse heating 6 Pre-storing a small amount of SF6 ensures that all SF coming in from the chamber 6 Can be refilled into the air chamber to realize nondestructive measurement. Recommended pre-stock: 0.03Kg, 0.03Kg pre-stored in this experiment
(6) After 30min, the measurement was completed, and the experimental data was 0.501m 3 The relative errors of the gas quantity of 18.25kg are as follows: 2.0% and 1.4%.
| Pressure MPa | Volume (true) m 3 | Gas quality (true) | Volume measurement m 3 | Gas mass measurement kg | Relative error of volume | Relative error of gas mass |
| 0.355 | 3.00 | 81.00 | 3.07 | 83.8 | 2.4% | 3.5% |
| 0.340 | 4.90 | 127.00 | 5.05 | 130.3 | 3.1% | 2.6% |
| 0.382 | 0.43 | 12.60 | 0.44 | 12.26 | 2.3% | -2.7% |
| 0.615 | 1.60 | 67.50 | 1.59 | 69.87 | -0.6% | 3.5% |
Effective volume V of air chamber of electrical equipment 1 The calculation is specifically that,
the gas density gamma of the gas chamber of the electrical equipment before and after the gas flows out can be obtained by the Betty-Bridgman empirical formula 10 And gamma 11 ，
Further calculate the gas mass m of the gas chamber of the electrical equipment before and after the deflation 10 And m 11 ：
m 10 = γ 10 V 1
m 11 = γ 11 V 1
Therefore, the amount of change Δm in the gas mass in the electrical equipment gas chamber is:
△m= m 10 - m 11 =γ 10 V 1 -γ 11 V 1
wherein V is 1 Is the effective volume of an air chamber of the electrical equipment, and the unit is m 3 ，
By m 20 And m 21 Respectively represents the mass of the gas in the constant volume tank before and after the gas of the electrical equipment flows out:
△m= m 10 - m 11 = m 21 - m 20
wherein m is 20 The mass of the gas before being discharged for the constant volume tank, m 21 The sulfur hexafluoride mass in the constant volume tank after the gas outflow of the electrical equipment is finished,
m 20 = γ 20 V 2
m 21 = （H-H 1 ）γ 21 V 2 + H 1 V 2 γ
wherein H is the height of the cylinder in the constant volume tank, the unit is m, gamma is the density of the liquid sulfur hexafluoride, and the value is 1880kg/m 3 Gas quality gamma of gas chamber of electric equipment before deflation 20 Gas quality gamma of gas chamber of electric equipment after gas release 21 ；
From Δm=m 21 - m 20 Calculating the value of Deltam, thereby calculating the effective volume V of the electrical equipment according to the following formula 1 ：
V 1 =（（H-H 1 ）γ 21 V 2 + H 1 V 2 γ-γ 20 V 2 ）/（γ 10 -γ 11 ）。
The application can directly measure the effective volume of the electrical equipment, is not limited to measurement in the process of charging and discharging the electrical equipment, does not need to be powered off when the electrical equipment is measured, and the application reversely heats the semiconductor refrigeration module to charge the gas into the electrical equipment after the measurement is completed, so that the application has almost no loss to sulfur hexafluoride gas.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. The utility model provides a sulfur hexafluoride electrical equipment effective volume nondestructive measurement device, has seted up on electrical equipment (1) and has filled gassing interface (2), fills gassing interface (2) and connects constant volume jar (6), a serial communication port, measurement device includes first manometer (3), first thermometer (4), solenoid valve (5), constant volume jar (6) and semiconductor refrigeration module (7), first manometer (3), first thermometer (4) and solenoid valve (5) set up on the connecting tube between filling gassing interface (2) and constant volume jar (6), the outside parcel of constant volume jar (6) has semiconductor refrigeration module (7), be connected with second manometer (8) and second thermometer (9) on constant volume jar (6), through cooperation of first manometer (3), first thermometer (4), solenoid valve (5), constant volume jar (6), semiconductor refrigeration module (7), second manometer (8) and second thermometer (9) to survey sulfur hexafluoride electrical equipment effective volume.
2. The nondestructive testing device for the effective volume of the sulfur hexafluoride electrical equipment according to claim 1, wherein the constant volume tank (6) is further connected with a liquid level meter (10) for testing the liquid level of the constant volume tank (6).
3. The nondestructive measurement method for the effective volume of the sulfur hexafluoride electrical equipment is characterized by comprising the following steps of:
a measuring device is connected between the air charging and discharging interface of the electrical equipment and the constant volume tank;
detecting the pre-gassing pressure P of an electrical apparatus 10 And temperature T 10 Detecting the pressure P before the constant volume tank is deflated 20 And temperature T 20 ；
Detecting the pressure of the electrical equipment in a charging and discharging state, and acquiring the pressure value P of the electrical equipment when the pressure drops by a threshold value 11 And a temperature value T 11 Obtaining the pressure value P of the constant volume tank 21 And a temperature value T 21 Indicating value H of liquid level meter 1 ；
According to the upper partSaid pressure P 10 Temperature T 10 Pressure P 20 Temperature T 20 Pressure value P 11 Temperature value T 11 Pressure value P 21 Temperature value T 21 Indicating value H of liquid level meter 1 Calculating the effective volume V of the air chamber of the electrical equipment 1 。
4. A method for non-destructive testing of the effective volume of a sulfur hexafluoride electrical equipment according to claim 3, wherein when said electrical equipment is deflated, the solenoid valve and the semiconductor refrigeration module are opened and the gas flows to the constant volume tank.
5. A method for the non-destructive testing of the effective volume of a sulfur hexafluoride electrical equipment according to claim 3, wherein said electrical equipment is tested under inflation and deflation conditions by a first pressure gauge.
6. A method for the non-destructive testing of the effective volume of a sulfur hexafluoride electrical equipment according to claim 3, wherein after the measurement is completed, the gas in the constant volume tank is recharged to the electrical equipment and the connection between the testing device and the electrical equipment is removed.
7. The nondestructive measurement method for the effective volume of the sulfur hexafluoride electrical equipment according to claim 6, wherein the step of recharging the gas in the constant volume tank to the electrical equipment is specifically to reversely electrify and heat the semiconductor refrigeration module, open the electromagnetic valve, heat the constant volume tank to a heating threshold value, and recharge the gas in the constant volume tank to the electrical equipment.
8. The nondestructive testing method for the effective volume of the sulfur hexafluoride electrical equipment according to claim 6, wherein the gas pressure in the constant volume tank is reduced to a set value before the connection between the testing device and the electrical equipment is removed, and the charging and discharging valve and the electromagnetic valve of the electrical equipment are closed.
9. The nondestructive testing method for the effective volume of the sulfur hexafluoride electrical equipment according to claim 3, wherein the amount of the pre-stored sulfur hexafluoride gas in the constant volume tank is equal to the residual amount in the constant volume tank after the semiconductor refrigeration module is reversely heated.
10. A method for non-destructive testing of the effective volume of a sulfur hexafluoride electrical equipment according to claim 3, wherein said semiconductor refrigerator refrigeration temperature is set to a refrigeration threshold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310863821.7A CN117073790A (en) | 2023-07-14 | 2023-07-14 | Nondestructive determination method and device for effective volume of sulfur hexafluoride electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310863821.7A CN117073790A (en) | 2023-07-14 | 2023-07-14 | Nondestructive determination method and device for effective volume of sulfur hexafluoride electrical equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117073790A true CN117073790A (en) | 2023-11-17 |
Family
ID=88718385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310863821.7A Pending CN117073790A (en) | 2023-07-14 | 2023-07-14 | Nondestructive determination method and device for effective volume of sulfur hexafluoride electrical equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117073790A (en) |
-
2023
- 2023-07-14 CN CN202310863821.7A patent/CN117073790A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106226000B (en) | A kind of vacuum sealing performance measurement device and method | |
| US8381577B2 (en) | Method and device for testing a container for leaks | |
| KR100929580B1 (en) | Leakage Tester for Low Temperature Valve | |
| US7347089B1 (en) | Gas volume contents within a container, smart volume instrument | |
| KR101881776B1 (en) | Collection device for a gas filling apparatus | |
| JP2008309698A (en) | Airtightness inspection device, airtightness inspection method and method for manufacturing airtight product | |
| JPS62231127A (en) | Airtight control and controller for package | |
| CN109141770B (en) | Method for reducing influence of state change of leak detector on helium mass spectrum suction gun accumulation method | |
| CN111157180B (en) | System and method for measuring ground leakage of airship | |
| CN107228810A (en) | A kind of device of acetylene absorption measurement | |
| CN117073790A (en) | Nondestructive determination method and device for effective volume of sulfur hexafluoride electrical equipment | |
| CN112611439B (en) | Device and method for measuring weight of sulfur hexafluoride gas | |
| CN110987291B (en) | Method for measuring and calculating relationship between vacuum degree of low-temperature gas cylinder and daily evaporation rate and adsorption capacity | |
| CN107367440B (en) | Method for acetylene adsorption measurement | |
| CN104155425B (en) | A kind of method of high precision PCT tester and test alloy material storing hydrogen PCT | |
| CN104132707A (en) | Calibration system and method for volume of closed container | |
| JP2016118528A (en) | Method and device for measuring leakage from elastic body | |
| CN207133152U (en) | A kind of device of acetylene absorption measurement | |
| CN206348334U (en) | Portable Insulating Oil Breakdown Voltage gassiness tester | |
| CN112556776B (en) | Gradient inflation and deflation SF based on constant volume method 6 Method for measuring volume of air chamber | |
| CN115931263A (en) | Constant-pressure-difference air tightness efficient testing method for large-size airship envelope | |
| CN110907151B (en) | Method for measuring and calculating relationship between vacuum degree of low-temperature gas cylinder and daily evaporation rate and adsorption capacity | |
| CN107957291B (en) | Calibration device | |
| KR102598332B1 (en) | System and Method for evaluating water vapor pumping performance of a vacuum pump | |
| CN113984292B (en) | Liquid hydrogen valve leakage detection device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |